Similar to blue balls; Ball ache occurs when a man spends all night grinding with a lady but, alas, does not ejaculate, leaving him with a dull ache in the testes. It is the worst pain a male can suffer.

There is only one cure to ball ache, and that my friends is known as a wank.

A: Why are you walking like John Wayne?
B: Ball ache.
A: I thought you were with Jane last night?
B: Indeed. She may look like a pro, but sadly she couldn't finish off a packet of crisps.
A: Sorry to hear that
B: Shhh... I'm off to wank.

when a man furiously masturbates or has sex about ten times in one day and feels fine, but wakes up the next morning and his balls ache.

Karen: Me and Phil did it ten times last night, and this morning he was crying he had such a painful ball ache.
Melinda: Well, my brother was in the room next to me just whacking off all day, this morning he was walking weird cause he had such painful ball ache.